There are some questions related to this same issue. For example, this one. But it doesn't work.
Let me show what I did in my code.
activity_main.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container"
android:layout_width="match_parent" android:layout_height="match_parent"
tools:context=".MainActivity" tools:ignore="MergeRootFrame" >
<fragment
android:id="@+id/my_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.example.zhouhao.test.MyFragment"
tools:layout="@layout/fragment_my" />
</FrameLayout>
fragment_my.xml (my main fragment which include a FragmentTabHost)
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.app.FragmentTabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="100"
android:orientation="horizontal">
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0" />
<LinearLayout
android:layout_width="0dp"
android:layout_weight="95"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="@+id/panel_content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</android.support.v4.app.FragmentTabHost>
fragment_tab1.xml (for the fragment corresponding to different tab, they are similar so that I only show you one code)
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" tools:context="com.example.zhouhao.test.TabFragment">
<!-- TODO: Update blank fragment layout -->
<TextView android:layout_width="match_parent" android:layout_height="match_parent"
android:text="@string/fragment_tab1" />
</FrameLayout>
MainActivity.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
FragmentManager fm = getSupportFragmentManager();
mMyFragment = (MyFragment) fm.findFragmentById(R.id.my_fragment);
}
}
public class MyFragment extends Fragment implements TabHost.OnTabChangeListener {
FragmentTabHost mFragmentTabHost;
public MyFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_my, container, false);
if (rootView != null) {
mFragmentTabHost = (FragmentTabHost) rootView.findViewById(android.R.id.tabhost);
mFragmentTabHost.setup(getActivity(), getActivity().getSupportFragmentManager(), R.id.panel_content);
TabFragment1 tab1Fragment = new TabFragment1();
TabFragment2 tab2Fragment = new TabFragment2();
TabFragment3 tab3Fragment = new TabFragment3();
TabHost.TabSpec spec1 = mFragmentTabHost.newTabSpec("1").setIndicator("");
TabHost.TabSpec spec2 = mFragmentTabHost.newTabSpec("2").setIndicator("");
TabHost.TabSpec spec3 = mFragmentTabHost.newTabSpec("3").setIndicator("");
mFragmentTabHost.addTab(spec1,tab1Fragment.getClass(), null);
mFragmentTabHost.addTab(spec2,tab2Fragment.getClass(), null);
mFragmentTabHost.addTab(spec3,tab3Fragment.getClass(), null);
mFragmentTabHost.setOnTabChangedListener(this);
return rootView;
} else {
return super.onCreateView(inflater, container, savedInstanceState);
}
}
@Override
public void onTabChanged(String tabId) {
BaseFragment f = (BaseFragment)getActivity().getSupportFragmentManager().findFragmentByTag(tabId);
Log.d("Log",tabId);
}
}
My problem is the BaseFragment is always null in my onTabChanged. Can anybody help? Thanks.